Decorative lamp for a string light



FIG. 1 is a top, left, front perspective view of a decorative lamp for a light string showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left hand side elevational view thereof;

FIG. 7 is a right hand side elevational view thereof; and,

FIG. 8 is a top, front perspective view thereof on a reduced scale, the light string being shown in broken lines for illustrative purposes only. 

The ornamental design for a decorative lamp for a light string, as shown and described. 